Method and apparatus for displaying charging state of battery of portable terminal

ABSTRACT

A method and apparatus for displaying a battery charging-state is disclosed. The method comprises measuring the charged voltage of a battery unit, determining the charging stage of the measured charged voltage, and sequentially and cyclically displaying icons that indicate a charging stage.

CLAIM PRIORITY

More than one reissue application has been filed for the reissue of U.S.Pat. No. 8,004,241. This application is a continuation reissue of, andclaims the benefit of, U.S. application Ser. No. 14/883,311, filed onOct. 14, 2015, now U.S. Pat. No. RE47,712, which is a continuationreissue of U.S. application Ser. No. 13/974,581, filed on Aug. 23, 2013,now U.S. Pat. No. RE45,797, which is a reissue application of U.S. Pat.No. 8,004,241, issued from U.S. application Ser. No. 11/936,177, filedon Nov. 7, 2007, which claims the benefit of the earlier filing date,pursuant to 35 USC 119, to that patent application entitled “Method andApparatus for Displaying Charging-State of Battery of PortableTerminal,” filed in the Korean Intellectual Property Office on Nov. 9,2006 and assigned Serial No. 2006-0110683, the contents of which areincorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a portable terminal, and moreparticularly, to a method and apparatus that displays the charging-stateof a battery of a portable terminal.

2. Description of the Related Art

Portable terminals are manufactured to provide a variety of functions(for example, a mobile communication service, a camera, an MP3 player, adigital multimedia broadcasting service). Since such functions arefrequently used through a portable terminal, the portable terminals areever increasing their power consumption.

In response to this increase in power consumption, the battery of aportable terminal must be frequently recharged.

The following is a description of a conventional method for displaying acharged state of a portable terminal battery.

FIG. 1 is a screen showing a battery charging-state of a conventionalportable terminal.

As shown by reference numeral 110, the conventional portable terminalhas cyclically displayed icons a, b, c, and d, which are indicative ofcharging stages, respectively, regarding of charging-states according tothe charging voltage of a battery unit. When the charging-state of thebattery unit becomes a fully charged state, the icon “d,” which is astill image, is displayed on the display, as shown by reference numeral120.

As such, the conventional charging-state display method only indicatesthat the battery unit has been charged, but does not display what stageor how much the battery unit is charged. Therefore, it is inconvenientin that a user cannot check how much the battery unit is charged orcheck how much charging capacity of the battery unit remains.

As well, the conventional portable terminal has disadvantages in that itforces the user to wait, without knowing, how much more time is requiredto recharge the battery since the terminal does not indicate therecharge time.

SUMMARY OF THE INVENTION

In order to resolve the above problems, the present invention is toprovide a method and apparatus that can form icons corresponding to thecharging states of a battery of a portable terminal and display theicons on the display, so that a user can check at least one of thecharging state, charging capacity, and remaining capacity of a battery.

According to the present invention, there is provided a method fordisplaying a battery charging state of a portable terminal, comprisingmeasuring a charged voltage of a battery unit; judging the chargingstage of the measured charged voltage, sequentially displaying iconsthat indicate stages of charging and cyclically performing the abovesteps.

In accordance with the present invention, there is provided a portableterminal comprising: a storage unit for storing charging-stage displayinformation where the charging stage of a charging voltage matches theicon data, a battery unit for charging charges supplied from a powersource and for converting the charged voltage caused by the charges intoa digital signal, a controller for determining icon data based on thecharging stage and a display unit for displaying icons based on thedetermined icon data.

BRIEF DESCRIPTION OF THE DRAWINGS

The above features and advantages of the present invention will be moreapparent from the following detailed description in conjunction with theaccompanying drawings, in which:

FIG. 1 is a screen showing a battery charging-state of a conventionalportable terminal.

FIG. 2 is a schematic block diagram illustrating a configuration of aportable terminal according to an embodiment of the present invention;

FIG. 3 is a flowchart describing operations of a portable terminalaccording to an embodiment of the present invention;

FIG. 4 is a screen showing a battery charging state according to anembodiment of the present invention; and

FIG. 5 is a screen showing a battery charging state according to anotherembodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The terminologies in the present application are defined as follows:

The portable terminal of the present invention refers to a conceptincluding all the devices that are portable and receive electric-powerfrom a battery. Such terminals may for example, be a mobilecommunication terminal, a mobile phone, a personal digital assistant(PDA), a smart phone, a digital multimedia broadcasting (DMB) receiver,an MP3 player, a digital camera, etc.

Although a battery is recharged through a plurality of processes, forconvenience, the recharging processes according to the present inventionwill be described based on four stages. However, it will be easilyappreciated to those skilled in the art that the present invention isnot limited by the following embodiments described based on the fourrecharging stages.

For four recharging stages of a battery, the present inventionintroduces four icons wherein each icon corresponds to one of fourexemplary charging stages as follows:

The icon labeled a (hereinafter referred to as ‘icon a’) denotes stage0, indicative of a first charging state of a battery. The icon labeled b(hereinafter referred to as ‘icon b’) denotes stage 1, indicative of asecond charging state of the battery. Similar to the icons a and b,icons c and d are defined to denote stages 2 and 3 indicative ofcorresponding charging states of the battery, respectively. The icons a,b, c, and d are stored in a storage unit of the portable terminal.

Embodiments of the present invention are described in detail withreference to the accompanying drawings. Elements and regions in thedrawings may be schematically illustrated for brevity and clarity.

FIG. 2 is a schematic block diagram illustrating a configuration of aportable terminal according to an embodiment of the present invention.

As shown in FIG. 2 , the portable terminal includes a communication unit210, an input unit 220, a display unit 230, a storage unit 240, abattery unit 250, and a controller 260.

The communication unit 210 is configured to include: a radio frequency(RF) transmitter for up-converting the frequency of transmitted signalsand amplifying the transmitted signals and an RF receiver for low-noiseamplifying a received RF signal and down-converting the frequency of thereceived RF signal.

The input unit 220 can be implemented by a touch pad or a key pad thatincludes various function keys, numeral keys, special keys, andcharacter keys, etc. The input unit 220 serves to transmit signals inputby a user to the controller 260 to control operations of the portableterminal.

The display unit 230 can be implemented by a liquid crystal display(LCD), etc., and displays various display data and operation states ofthe portable terminal. Specifically, the display unit 230 of the presentinvention displays icons indicative of charging states of the batteryunit 250, according to icon data stored in the storage unit 240. Thedisplay unit 230 may also act as input unit 220 when a touch screencapability is available.

The storage unit 240 stores programs and data, which are required forthe portable terminal operations. Specifically, the storage unit 240stores charging-state display information as shown in Table 1.

TABLE 1 Charged Voltage Charging Icon Data [V] Stage Type of IconDisplay Sequence 2.05-2.09999 Stage 0 a, b, c, d a->b->c->d->a->b . . . 2.1-2.49999 Stage 1 b, c, d b->c->d->b->c . . .  2.5-2.89999 Stage 2 c,d c->d->c->d . . . 2.9 Stage 3 d d

As described in Table 1, the charging-state display information includesa charged voltage charged in a charging circuit 252, a charging statecorresponding to the charged voltage, and icon data indicative ofcorresponding charging states (or charging voltages). The charging-statedisplay information is preferably stored as a database, matching thecharging voltage, charging-state, and icon data with each other.

As well, the icon data includes the type of icon, which corresponds tothe charging stage of the battery unit 250, and display sequence for theicons.

For example, when the charged voltage of the charging circuit 252 is2.23V, the controller 260 determines that the charging stage is stage 1,and then selects icons b, c, and d from a sub field of Type of Icon inthe Icon Data field, as shown in Table 1.

After that, the controller 260 controls the display unit 230 so that theselected icons b, c, and d can be displayed according to the displaysequence of b->c->d->b->c-> . . . in a sub field of the Display Sequencein the Icon Data field.

The battery unit 250 converts AC power (110 V or 220 V) from a powersource into DC power and charges the battery using the DC power. Afterthat, the battery unit 250 converts the charged voltage into a digitalsignal and transmits it to the controller 260.

To this end, the battery unit 250 is preferably configured to include anAC adapter 253, a charging circuit 252, and an A/D converter 251.

The AC adapter 253 converts AC power (110 V or 220 V) from the powersource into DC power. The charging circuit 252 charges based on the DCpower outputted from the AC adapter 253. The A/D converter 251 convertsthe charged voltage of the charging circuit 252, which is an analogsignal, into a digital signal and transmits it to the controller 260.

The controller 260 controls the entire operation of the portableterminal.

Specifically, the controller 260 of the present invention detects avoltage as a digital signal which the A/D converter 251 has converted,and determines a charging state based on the detected charged voltage.

To this end, the controller 260 is preferably configured to include acharging-stage determining unit 261. As well, the controller 260performs the control in such a way that icons indicative of chargingstages of the battery unit 250 can be displayed, according to the icondata stored in the storage unit 240.

FIG. 3 is a flowchart describing a method for determining and displayinga charged voltage of a portable terminal according to an embodiment ofthe present invention.

As shown in FIGS. 1 and 2 , the controller 260 makes a determination asto whether the battery unit 250 is charging the battery based on powersupplied from a power source (S301).

More specifically, when the power is applied to the battery unit 250,the charging circuit 252 charges the battery. The A/D converter 251measures a voltage caused by the charging voltage and converts it into adigital voltage value (i.e., a digital signal).

When the determination of step S301 is positive, the charging-stagedetermining unit 261 of the controller 260 receives the digital voltagevalue provided by the A/D converter 251, which converts the determinedcharged voltage, and determines the charging stage of the battery andbased on the charging stage displays information stored in the storageunit 240 (S307).

The controller 260 makes a determination whether the charged voltage ofthe battery unit 250 is within the voltage range of stage 0 (S309). Whenthe determination of step S309 is positive, the controller 260 controlsthe display unit 230 so that an icon indicative of a charging-state ofstage 0 can be displayed (S310).

Next, the controller 260 performs the control in such a way that iconscorresponding to stage 1 (S311), stage 2 (S312), and stage 3 (S313) canbe sequentially displayed. For example, when the charged voltage is lessthan 2.0999V, as shown by reference numeral 410 of FIG. 4 , the iconsare cyclically displayed as the sequence of a, b, c, and d.

After that, the procedure returns to step S301 so that the controller260 determines whether power is applied to the battery unit 250, andthen repeatedly proceeds with the above steps.

On the other hand, when the determination of step S309 is negative, orthe charged voltage is not within the voltage range of stage 0, thecontroller 260 determines whether the charged voltage is within thecharged voltage range of stage 1 (S314).

When the determination of step S314 is positive, the controller 260controls the display unit 230 so that an icon indicative of a chargingstate of stage 1 can be displayed (S315).

After the display of the stage 1 icon (S315), the controller 260performs the control in such a way that icons corresponding to stage 2(S316) and stage 3 (S317) can be sequentially displayed. For example,when the charged voltage is in the range of 2.1˜2.49999V, as shown byreference numeral 420 of FIG. 4 , the icons are cyclically displayed asthe sequence of b, c, and d.

The procedure returns to step S301 so that the controller 260 determineswhether power is applied to the battery unit 250, and then repeatedlyproceeds with the above steps.

When the determination of step S314 is negative, or the charging voltageis not within the charged voltage range of stage 1, the controller 260determines whether the charged voltage is within the charged voltagerange of stage 2 (S318).

When the determination of step S318 is positive, or the charging voltageis within the charged voltage range of stage 2, the controller 260controls the display unit 230 so that icons indicative of chargingstates of stage 2 (S319) and stage 3 (S320) can be displayed.

After that, the controller 260 performs the control in such a way thaticons corresponding to stage 2 (S319) and stage 3 (S320) can besequentially displayed. That is, when the charged voltage is in therange of 2.5˜2.8999V, as shown by reference numeral 430 of FIG. 4 , theicons are cyclically displayed as the sequence of c and d.

Next, the procedure returns to step S301 so that the controller 260determines whether power is applied to the battery unit 250, and thenrepeatedly proceeds with the above steps.

In addition, when the determination of step S318 is negative, or thecharged voltage is not within the charging voltage range of stage 2, thecontroller 260 determines that the charged voltage is within the chargedvoltage of stage 3 (fully charged state), and controls the displays unitso that the icon indicative of a fully charged state of stage 3 can bedisplayed (8321). That is, when the charged voltage is 2.9V, as shown byreference numeral 440, the icon d, which is a still image, is displayed.

FIG. 4 is a screen showing a battery charging state according to anembodiment of the present invention.

Referring to FIG. 4 , the controller 260 measures the charged voltage ofthe battery unit 250 to check the charging stage corresponding to themeasured charged voltage, and then displays an icon corresponding to thecharging stage.

After that, the controller 260 sequentially displays icons thatcorrespond to a charging stage higher than the stage of the displayedicon through to the fully charged stage.

For example, when power is applied to the battery unit 250, whosecharging state is stage 0, the display unit 230 cyclically displaysicons a, b, c, and d, in order, as shown by reference numeral 410 ofFIG. 4 . After that, the battery unit 250 arrives at the charging stateof stage 1, and the display unit 230 cyclically displays icons b, c, andd, in order, as shown by reference numeral 420 of FIG. 4 . In addition,the voltage of battery unit 250 arrives at the charging state of stage2, and the display unit 230 cyclically displays icons c, and d, inorder, as shown by reference numeral 430 of FIG. 4 . Repeatedly, thebattery unit 250 arrives at the charging state of stage 3, and thedisplay unit 230 displays the icon d, which is a still image, as shownby reference numeral 440 of FIG. 4 .

FIG. 5 is a screen showing a battery charging state according to anotherembodiment of the present invention.

Referring to FIG. 5 , the controller 260 displays icons, distinguishingbetween a region (or regions) of the icons, indicating that a chargingstage has been completed, and another region (or regions), indicatingthat charging is presently performed. Such a displaying method is toallow a user to read the charging stages of the battery unit 250 withouttrouble. Preferably, this method distinguishes charging states by color,brightness, or patterns formed on corresponding regions of the icons.

For example, when the voltage of battery unit 250 is in a charging stateof stage 0, the controller 260 cyclically displays icons whosecorresponding regions of the icons are only filled with only slantedlines, to indicate that it is presently charging, as shown by referencenumeral 510 in FIG. 5 . After completing stage 0, the controller 260fills the first region (level 1) of the icons with a color, for example,a dimmed color, and, at the same time, cyclically displays the iconswhose first region is filled with a dimmed color and whose second andthird regions of the icons (level 2 and level 3, respectively) arefilled with slanted lines, to indicate that it is presently charging, asshown by reference numeral 520 in FIG. 5 . After completing stage 1, thecontroller 260 further fills the second region of the icons with thesame color as the first regions, and, at the same time, cyclicallydisplays the icons whose first and second regions are filled with thedimmed color and whose third region is filled with slanted lines, toindicate that it is presently charging, as shown by reference numeral530 in FIG. 5 . And, after the battery unit 250 is fully charged, thecontroller 260 further fills the third region and displays the still orsteady icon with the dimmed color, that is, the first, second and thirdregions are filled with the dimmed color, as shown by reference numeral540 in FIG. 5 .

The above-described methods according to the present invention can berealized in hardware or as software or computer code that can be storedin a recording medium such as a CD ROM, an RAM, a floppy disk, a harddisk, or a magneto-optical disk or downloaded over a network, so thatthe methods described herein can be rendered in such software using ageneral purpose computer, or a special processor or in programmable ordedicated hardware, such as an ASIC or FPGA. As would be understood inthe art, the computer, the processor or the programmable hardwareinclude memory components, e.g., RAM, ROM, Flash, etc. that may store orreceive software or computer code that when accessed and executed by thecomputer, processor or hardware implement the processing methodsdescribed herein.

While the present invention has been particularly shown and describedwith reference to embodiments thereof, it will be understood by those ofordinary skill in the art that various changes in form and details maybe made therein without departing from the spirit and scope of thepresent invention as defined by the following claims.

As described in the foregoing, a method and apparatus can display abattery charging-state of a portable terminal through an icon on thedisplay, thus allowing a user to check a state where the battery hasbeen charged, a charged capacity, and a remaining capacity of thebattery.

What is claimed is:
 1. A method for displaying a battery charging-stateof a portable terminal, comprising: (a) measuring a charged voltage of abattery unit; (b)determining a charging stage of the measured chargedvoltage; (c) sequentially and cyclically displaying during a chargingperiod a plurality of sequential icons that are sequentially displayedin a unique sequence of icons changing states during each respectivelevel of charge as an indication of both: (1) a specific stage of alevel of charge in said battery unit from a charged state of eachrespective charging stage to a fully charged state, and (2) that thebattery unit is currently undergoing a charging operation; (d) repeatingstep (a) to step (c) until the battery unit is fully charged; whereineach specific stage of the level of charge is displayed according to apre-stored display sequence for the icons.
 2. The method of claim 1,wherein the steps of measuring, determining, and displaying are repeateduntil the battery unit is fully charged, wherein a single icon issteadily displayed.
 3. The method of claim 1, wherein the determiningthe charging stage is performed by using charging stage displayinformation formed of different values of charging voltages that arematched with icon data associated with each of the charging stages. 4.The method of claim 3, wherein the icon data comprises types and displaysequence of icons to be displayed sequentially while recharging thebattery, according to the charging stages.
 5. The method of claim 1,wherein the step of sequentially displaying icons serves to display theicons in sequence based on types and display sequence.
 6. The method ofclaim 1, wherein the step of sequentially displaying icons serves todisplay icons, distinguishing between a region of the icons indicatingthat a charging stage has been completed and another region indicatingthat charging is presently occurring.
 7. A portable terminal comprising:a storage unit for storing charging stage display information where thecharging stage of a voltage is associated with icon data; a battery unitfor accepting a charging voltage supplied from a power source and forconverting the charged voltage into a digital signal; a controller fordetermining icon data based on the stage of charging of the chargedvoltage; and a display unit for displaying said icon data sequentiallyand repeatedly at each respective charging state during a chargingperiod a plurality of sequential icons that are sequentially displayedin a unique sequence of icons changing states during each respectivelevel of charge as an indication of both: (1) a specific stage of alevel of charge in said battery unit from an initial charged state ofeach respective charging stage to a fully charged state, and (2) thatthe battery unit is currently undergoing a charging operation; whereineach specific stage of the level of charge is displayed according to apre-stored display sequence for the icons.
 8. The terminal of claim 7,wherein the controller comprises a charging stage determining unit. 9.The terminal of claim 7, wherein the controller displays icons,distinguishing between a region of the icons indicating that a chargingstage has been completed and another region indicating that charging ispresently occurring.
 10. A portable terminal comprising: a battery unitreceiving a charging voltage, a charge determining unit measuring alevel of voltage charge in said battery unit and determining an iconfrom a plurality of icons based on said measured level of voltagecharge; and a display unit sequentially displaying each of saidplurality of icons beginning from said determined icon, excludingselected ones of said plurality of icons and repeatedly displaying eachof said plurality of icons until the battery unit is fully charged;wherein each specific stage of the level of charge is displayedaccording to a pre-stored display sequence for the icons that is aunique display sequence of icons changing states during each respectivelevel of charge as an indication of both: (1) a specific stage of alevel of charge in said battery unit from an initial charged state ofeach respective charging stage to a fully charged state, and (2) thatthe battery unit is currently undergoing a charging operation.
 11. Theportable terminal of claim 10, wherein the charging determining unitcomprises: a memory containing a plurality of progressively higher,non-overlapping, voltage ranges and icon information associated witheach of said ranges.
 12. The portable terminal of claim 11, wherein thestep of determining an icon comprises: selecting one of said pluralityof voltages ranges based on said measured voltage level; and selectingan icon associated with the selected voltage range.
 13. The portableterminal of claim 11, wherein the step of displaying further comprisesthe steps of: displaying each of said icons in a different color. 14.The portable terminal of claim 10, the charge determining unit furthercomprising: an analog-to-digital converter for converting said measuredlevel of voltage to a digital signal.
 15. The portable terminal of claim10, wherein said icon display is held steady when a full level of chargeis determined.
 16. The portable terminal of claim 11, wherein saidselected excluded icons are icons associated with voltage ranges lowerthan said measured voltage.
 17. The portable terminal of claim 11,wherein each of said icons includes a plurality of sub-icons, whereinsaid sub-icons represent one of said plurality of voltage ranges.
 18. Aportable terminal comprising: a rechargeable battery unit receiving acharging voltage; a controller for: (a)measuring a voltage charge insaid battery unit; (b)converting said measured voltage charge into adigital signal; (c) determining an icon sequence based on said digitalsignal; and (d) repeating step (a) to step (c) until the battery unit isfully charged; a display unit for cyclically displaying said iconsequence corresponding to a pre-stored display sequence for the iconsthat is a unique display sequence of icons changing states during eachrespective level of charge as an indication of both: (1) a specificstage of a level of charge in said battery unit from an initial chargedstate of each respective charging stage to a fully charged state, and(2) that the battery unit is currently undergoing a charging operation.19. The terminal of claim 18, wherein said icon sequence is determinedbased on said measured signal is within one of a plurality ofnon-overlapping, progressive higher voltage ranges.
 20. The terminal ofclaim 19, wherein the determination of an icon sequence is performed bycomparing said digital signal value to a plurality of range values. 21.An electronic device comprising: a battery unit; a display unit; amemory configured to store a plurality of images, each of the pluralityof images corresponding to each of charging stages of the battery unit;and at least one processor, wherein the at least one processor isconfigured to: (a) identify a charging state of the battery unit, (b)determine a charging stage among the charging stages based on thecharging state of the battery unit, (c) control to sequentially display,at the determined charging stage, a subset of the plurality of images ina sequential order from the determined charging stage toward a fullycharged stage on the display unit while undergoing a charging operation,and (d) repeat step (a) to step (c) to indicate that the battery unit isbeing charged.
 22. The electronic device of claim 21, wherein the atleast one processor is configured to repeat step (a) to step (c) untilthe battery unit is fully charged.
 23. The electronic device of claim22, wherein the at least one processor is configured to control todisplay an image corresponding to the fully charged stage on the displaywhen the battery unit is fully charged.
 24. The electronic device ofclaim 21, wherein the at least one processor is configured to determinethe charging stage of the electronic device.
 25. A method for displayinga charging status for a battery unit of an electronic device,comprising: (a) identifying, by at least one processor, a charging stateof the battery unit; (b) determining a charging stage among chargingstages based on the charging state of the battery unit; (c) displayingsequentially, at the determined charging stage, a subset of a pluralityof images in a sequential order from the determined charging stagetoward a fully charged stage on a display unit of the electronic devicewhile undergoing a charging operation; and (d) repeating step (a) tostep (c) to indicate that the battery unit is being charged, wherein theplurality of images is stored in a memory of the electronic device, eachof the plurality of images corresponding to each of the charging stagesof the battery unit.
 26. The method of claim 25, wherein repeating step(a) to step (c) comprises repeating step (a) to step (c) until thebattery unit is fully charged.
 27. The method of claim 26, furthercomprising steadily displaying an image corresponding to the fullycharged stage on the display unit when the battery unit is fullycharged.
 28. An electronic device comprising: a battery unit; a displayunit; a memory storing a plurality of images, each of the plurality ofimages corresponding to each of charging stages of the battery unit; andat least one processor configured to: measure a charge state of thebattery unit corresponding to a charging stage, control to sequentiallydisplay images corresponding to a first charging stage, a secondcharging stage and a fully charged stage individually in a sequence onthe display unit while undergoing a charging operation when the chargestate measured by the at least one processor corresponds to the firstcharging stage, control to sequentially display images corresponding tothe second charging stage and the fully charged stage individually in asequential order on the display unit while undergoing the chargingoperation when the charge state measured by the at least one processorcorresponds to the second charging stage, and control to display animage corresponding to the fully charged stage when the charge statemeasured by the at least one processor corresponds to the fully chargedstage.
 29. The electronic device of claim 28, wherein the at least oneprocessor is configured to determine the charging stage of theelectronic device.
 30. A method for displaying a charging status for abattery unit of an electronic device, comprising: measuring, by at leastone processor of the electronic device, a charge state of the batteryunit corresponding to a charging stage; displaying sequentially imagescorresponding to a first charging stage, a second charging stage and afully charged stage individually in a predetermined sequence on adisplay unit of the electronic device while undergoing a chargingoperation when the charge state measured by the at least one processorcorresponds to the first charging stage; displaying sequentially imagescorresponding to the second charging stage and the fully charged stageindividually in a sequential order on the display unit while undergoingthe charging operation when the charge state measured by the at leastone processor corresponds to the second charging stage; and displayingsteadily an image corresponding to the fully charged stage when thecharge state measured by the at least one processor corresponds to thefully charged stage, wherein a plurality of images is stored in a memoryof the electronic device, each of the plurality of images correspondingto each of charging stages of the battery unit.